Home / 39,220.90-54,124.78-21,315.86

Finding the Fourth Proportional to 39,220.90, 54,124.78 and 21,315.86

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Solution

The fourth proportional to 39,220.90, 54,124.78 and 21,315.86 is: 29,415.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,220.90 : 54,124.78 = 21,315.86 : x
  2. Step 2: Convert to fraction form
    39,220.90/54,124.78 = 21,315.86/x
  3. Step 3: Cross multiply
    39,220.90x = 54,124.78 × 21,315.86
  4. Step 4: Simplify right side
    39,220.90x = 1,153,716,233.01
  5. Step 5: Solve for x
    x = 1,153,716,233.01/39,220.90
  6. Step 6: Final answer
    x = 29,415.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.